mongoose push if not exists

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Mongoose push item to array if not exists
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2edited Dec 30, 2020 at 19:35
You could use the pipeline form of update with the $cond operator. If the field1 value already exists, keep the value of the array the same, if not, append the new value to the end.
Perhaps something similar to:

const newValue = {field1: 2, field2: 6};

db.collection.update({match criteria},
[{$set:{
array:{
$cond:{
if: {$in: [newValue.field1, "$array.field1"]},
then: "$array",
else: {$concatArrays: ["$array", [newValue]]}]}
}
}
}}]
)
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https://stackoverflow.com/questions/65480828
Mongoose push item to array if not exists
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